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https://www.readbyqxmd.com/read/29343583/structural-study-of-the-c-terminal-domain-of-non-structural-protein-1-from-japanese-encephalitis-virus
#1
Thanalai Poonsiri, Gareth S A Wright, Michael S Diamond, Lance Turtle, Tom Solomon, Svetlana V Antonyuk
Japanese encephalitis virus (JEV) is a mosquito-transmitted Flavivirus that is closely related to other emerging viral pathogens including dengue, West Nile (WNV) and Zika viruses. JEV infection can result in meningitis and encephalitis, which in severe cases cause permanent brain damage and death. JEV occurs predominantly in rural areas throughout Southeast Asia, the Pacific islands and the Far East, causing around 68,000 cases worldwide each year. In this study, we present a 2.1 Å resolution crystal structure of the C-terminal β-ladder domain of JEV non-structural protein 1 (NS1-C)...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29323278/structural-biology-of-zika-virus-and-other-flaviviruses
#2
REVIEW
S Saif Hasan, Madhumati Sevvana, Richard J Kuhn, Michael G Rossmann
Zika virus (ZIKV) is an enveloped, icosahedral flavivirus that has structural and functional similarities to other human flavivirus pathogens such as dengue (DENV), West Nile (WNV) and Japanese encephalitis (JEV) viruses. ZIKV infections have been linked to fetal microcephaly and the paralytic Guillain-Barré syndrome. This review provides a comparative structural analysis of the assembly, maturation and host-cell entry of ZIKV with other flaviviruses, especially DENV. We also discuss the mechanisms of neutralization by antibodies...
January 2018: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/29297305/pharmacophore-anchor-models-of-flaviviral-ns3-proteases-lead-to-drug-repurposing-for-denv-infection
#3
Nikhil Pathak, Mei-Ling Lai, Wen-Yu Chen, Betty-Wu Hsieh, Guann-Yi Yu, Jinn-Moon Yang
BACKGROUND: Viruses of the flaviviridae family are responsible for some of the major infectious viral diseases around the world and there is an urgent need for drug development for these diseases. Most of the virtual screening methods in flaviviral drug discovery suffer from a low hit rate, strain-specific efficacy differences, and susceptibility to resistance. It is because they often fail to capture the key pharmacological features of the target active site critical for protein function inhibition...
December 28, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/29288700/erythrosin-b-is-a-potent-and-broad-spectrum-orthosteric-inhibitor-of-the-flavivirus-ns2b-ns3-protease
#4
Zhong Li, Srilatha Sakamuru, Ruili Huang, Matthew Brecher, Cheri A Koetzner, Jing Zhang, Haiying Chen, Cheng-Feng Qin, Qing-Yu Zhang, Jia Zhou, Laura D Kramer, Menghang Xia, Hongmin Li
Many flaviviruses, such as Zika virus (ZIKV), Dengue virus (DENV1-4) and yellow fever virus (YFV), are significant human pathogens. Infection with ZIKV, an emerging mosquito-borne flavivirus, is associated with increased risk of microcephaly in newborns and Guillain-Barré syndrome and other complications in adults. Currently, specific therapy does not exist for any flavivirus infections. In this study, we found that erythrosin B, an FDA-approved food additive, is a potent inhibitor for flaviviruses, including ZIKV and DENV2...
December 27, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29284418/the-aetiologies-of-central-nervous-system-infections-in-hospitalised-cambodian-children
#5
Paul Turner, Kuong Suy, Le Van Tan, Pora Sar, Thyl Miliya, Nguyen Thi Thu Hong, Vu Thi Ty Hang, Nguyen Thi Han Ny, Sona Soeng, Nicholas P J Day, H Rogier van Doorn, Claudia Turner
BACKGROUND: Central nervous system (CNS) infections are an important cause of childhood morbidity and mortality. The aetiologies of these potentially vaccine-preventable infections have not been well established in Cambodia. METHODS: We did a one year prospective study of children hospitalised with suspected CNS infection at Angkor Hospital for Children, Siem Reap. Cerebrospinal fluid specimens (CSF) samples underwent culture, multiplex PCR and serological analysis to identify a range of bacterial and viral pathogens...
December 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29244615/risk-assessment-for-japanese-encephalitis-vaccination
#6
Lance Turtle, Carolyn Driver
Japanese encephalitis (JE) is the most commonly diagnosed viral encephalitis in Asia. JE is caused by a virus called JE virus (JEV), a member of the genus Flavivirus, family Flaviviridae, and is transmitted by Culex mosquitoes. Neutralising antibody to JEV protects against JE, and can be induced by vaccination. JE is a potential threat to travellers to endemic areas, which are most of South and Southeast Asia and some Pacific Islands. The risk of JE can be expected to increase with increasing mosquito exposure and time spent in regions and seasons of active transmission...
December 15, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29244182/poor-performance-of-two-rapid-immunochromatographic-assays-for-anti-japanese-encephalitis-virus-immunoglobulin-m-detection-in-cerebrospinal-fluid-and-serum-from-patients-with-suspected-japanese-encephalitis-virus-infection-in-laos
#7
Onanong Sengvilaipaseuth, Josée Castonguay-Vanier, Anisone Chanthongthip, Ooyanong Phonemixay, Soulignasack Thongpaseuth, Manivanh Vongsouvath, Paul N Newton, Tehmina Bharucha, Audrey Dubot-Pérès
Background: Japanese encephalitis virus (JEV) is a leading identified cause of encephalitis in Asia, often occurring in rural areas with poor access to laboratory diagnostics. We evaluated two rapid diagnostic tests (RDTs) for anti-JEV immunoglobulin M (IgM) detection. Methods: Consecutive cerebrospinal fluid and serum from 388 patients (704 samples) with suspected JEV infections admitted to six hospitals in Laos were tested with one of two SD-Bioline anti-JEV IgM RDTs and the World Health Organization standard anti-JEV IgM enzyme-linked immunosorbent assay (ELISA; Panbio Japanese Encephalitis-Dengue IgM Combo ELISA...
December 13, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29243139/prevalence-and-risk-factors-of-japanese-encephalitis-virus-jev-in-livestock-and-companion-animal-in-high-risk-areas-in-malaysia
#8
Kiven Kumar, Siti Suri Arshad, Gayathri Thevi Selvarajah, Jalila Abu, Ooi Peck Toung, Yusuf Abba, Faruku Bande, A R Yasmin, Reuben Sharma, Bee Lee Ong, Anisah Abdul Rasid, Norsuzana Hashim, Amira Peli, E P Heshini, Ahmad Khusaini Mohd Kharip Shah
Japanese encephalitis (JE) is vector-borne zoonotic disease which causes encephalitis in humans and horses. Clinical signs for Japanese encephalitis virus (JEV) infection are not clearly evident in the majority of affected animals. In Malaysia, information on the prevalence of JEV infection has not been established. Thus, a cross-sectional study was conducted during two periods, December 2015 to January 2016 and March to August in 2016, to determine the prevalence and risk factors in JEV infections among animals and birds in Peninsular Malaysia...
December 14, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/29205199/seroprevalence-of-japanese-encephalitis-virus-west-nile-virus-in-alappuzha-district-kerala
#9
Anukumar Balakrishnan, Romy Jose Thekkekare, Gajanan Sapkal, Babasaheb V Tandale
BACKGROUND & OBJECTIVES: Several outbreaks of acute encephalitis syndrome (AES) have been reported in Alappuzha district, Kerala State, India, in the past. The aetiology of these outbreaks was either inconclusive or concluded as probable Japanese encephalitis virus (JEV) infection based on clinical presentation. The role of West Nile virus (WNV) in AES outbreaks was also determined. However, the extent of WNV infection has not been studied in this region previously. A population-based cross-sectional serosurvey study was undertaken to determine the seroprevalence of JEV and WNV in Alappuzha district...
July 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/29197806/immunofluorescence-based-biosensor-for-the-determination-of-dengue-virus-ns1-in-clinical-samples
#10
Nadiya T Darwish, Shamala D Sekaran, Yatimah Alias, Sook Mei Khor
The sharp increase in incidence of dengue infection has necessitated the development of methods for the rapid diagnosis of this deadly disease. Here we report the design and development of a reliable, sensitive, and specific optical immunosensor for the detection of the dengue nonstructural protein 1 (NS1) biomarker in clinical samples obtained during early stages of infection. The present optical NS1 immunosensor comprises a biosensing surface consisting of specific monoclonal NS1 antibody for immunofluorescence-based NS1 antigen determination using fluorescein isothiocyanate (FITC) conjugated to IgG antibody...
November 30, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29192069/full-length-genome-sequence-of-japanese-encephalitis-virus-strain-fc792-isolated-from-guangxi-china
#11
Bingxia Lu, Yibin Qin, Bin Li, Ying He, Qunpeng Duan, Jiaxing Liang, Zhongwei Chen, Qianlian Su, Bingfen Bi, Wu Zhao
We report here the complete genomic sequence of Japanese encephalitis virus (JEV) strain FC792, isolated from aborted fetuses of sows which were unimmunized with JEV vaccines in Guangxi Province, southern China. The complete JEV genome of strain FC792 had the highest nucleotide homology (99.7%) and amino acid identity (99.4%) with the sequence of JEV strain SA14-14-2 (GenBank accession number AF315119). Phylogenetic analysis showed that strain FC792 had the closest phylogenetic relationship to the sequence of strain YUNNAN0901 (GenBank accession number JQ086762)...
November 30, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29191708/neuroprotective-effect-of-tetrahydropalmatine-in-japanese-encephalitis-virus-strain-gp-78-infected-mouse-model
#12
Huang Lixia, Chen Jun, Hu Song, Yuan FaHu, Tu Jinwen
Japanese encephalitis virus (JEV), known to affect children, is a major cause of severe encephalopathy. Its prevalence has been percolated over wider regions of Southern Asia. JEV is associated with neurodegeneration, severe inflammation, increased oxidative stress and elevated levels of stress linked proteins. Four groups of 15 mice each (4-5 weeks old BALB/c mice of either sex) was used for the study. Mice were intravenously infected with lethal dose of 3 × 105 pfu of JEV, followed by mortality after 8 days...
November 27, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29162867/broad-spectrum-antiviral-agents-secreted-phospholipase-a2-targets-viral-envelope-lipid-bilayers-derived-from-the-endoplasmic-reticulum-membrane
#13
Ming Chen, Chie Aoki-Utsubo, Masanori Kameoka, Lin Deng, Yutaka Terada, Wataru Kamitani, Kei Sato, Yoshio Koyanagi, Makoto Hijikata, Keiko Shindo, Takeshi Noda, Michinori Kohara, Hak Hotta
Hepatitis C virus (HCV), dengue virus (DENV) and Japanese encephalitis virus (JEV) belong to the family Flaviviridae. Their viral particles have the envelope composed of viral proteins and a lipid bilayer acquired from budding through the endoplasmic reticulum (ER). The phospholipid content of the ER membrane differs from that of the plasma membrane (PM). The phospholipase A2 (PLA2) superfamily consists of a large number of members that specifically catalyse the hydrolysis of phospholipids at a particular position...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29155034/identification-of-a-novel-porcine-oasl-variant-exhibiting-antiviral-activity
#14
Changjing Zhao, Sheng Zheng, Dan Zhu, Xue Lian, Weiting Liu, Feng Hu, Puyan Chen, Ruibing Cao
2', 5'-Oligoadenylate synthetase-lilke (OASL) protein is an atypical oligoadenylate synthetase (OAS) family member, which possesses antiviral activity but lacks 2', 5'-oligoadenylate synthetase activity. Here, a novel variant of porcine OASL (pOASL2) was identified through RT-PCR amplification. This gene is distinguishable from the previously described wild-type porcine OASL (pOASL1). The gene appears to be derived from a truncation of exon 4 plus 8 nucleotides of exon 5 with a premature termination, measuring only 633 bp in length, although its position corresponds to that of pOASL1...
November 15, 2017: Virus Research
https://www.readbyqxmd.com/read/29152704/west-nile-disease-in-tunisia-an-overview-of-60-years
#15
Salah Hammami, Thameur Ben Hassine, Annamaria Conte, Jihène Amdouni, Fabrizio De Massis, Soufiène Sghaier, Sonia Ben Hassen
West Nile virus (WNV) is an arthropod borne virus of public health importance. The virus is a member of the genus Flavivirus and belongs to the Japanese encephalitis virus (JEV) antigenic complex under the Flaviviridae family. The WNV is continuously spreading across Tunisia especially in the coastal and Southern area of the country. The first human West Nile disease (WND) epidemic in Tunisia occurred in 1997, since then, the quantity and the extension of spillover effects increased constantly. However, the existing knowledge of factors triggering such events continues to be rather poor...
September 30, 2017: Veterinaria Italiana
https://www.readbyqxmd.com/read/29149532/exploitation-of-micrornas-by-japanese-encephalitis-virus-in-human-microglial-cells
#16
Meghana Rastogi, Neha Srivastava, Sunit K Singh
JEV infection in CNS leads to the JE neuroinflammation. Children and old age individual have been reported to be more prone to JEV infection. MicroRNAs are endogenous, small non-coding RNAs, which regulate the gene expression. These are ∼22 nucleotide long, conserved RNA sequence that binds at the 3'UTR of a target mRNA and regulate the post-transcriptional gene expression. The role of microRNAs has been reported in several diseases like cancer, viral infection, neuro-degeneration, diabetes etc. In the present study, the human microglial cells were infected with JEV (JaOArS982)...
November 17, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/29109371/seasonal-patterns-of-japanese-encephalitis-and-associated-meteorological-factors-in-taiwan
#17
Che-Liang Lin, Hsiao-Ling Chang, Chuan-Yao Lin, Kow-Tong Chen
The persistent transmission of Japanese encephalitis virus (JEV) in Taiwan necessitates exploring the risk factors of occurrence of Japanese encephalitis (JE). The purpose of this study was to assess the relationship between meteorological factors and the incidence of JE in Taiwan. We collected data for cases of JE reported to the Taiwan Centers for Disease Control (Taiwan CDC) from 2000 to 2014. Meteorological data were obtained from the Taiwan Central Weather Bureau. The relationships between weather variability and the incidence of JE in Taiwan were determined via Poisson regression analysis and a case-crossover methodology...
October 29, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29083983/investigation-on-mosquito-borne-viruses-at-lancang-river-and-nu-river-watersheds-in-southwestern-china
#18
Lingli Li, Xiaofang Guo, Qiumin Zhao, Yigang Tong, Hang Fan, Qiang Sun, Shaozhen Xing, Hongning Zhou, Jiusong Zhang
During 2007 and 2010, an extensive entomological survey was performed to assess the distribution of mosquitoes and mosquito-borne arboviruses at Lancang River and Nu River watersheds in southwestern China. A total of 20,450 mosquitoes consisting 20 species was trapped and submitted 261 pools according to species and location. Culex tritaeniorhynchus and Anopheles sinensis were the most abundant species. Eighty-seven isolates representing 11 virus species in 8 genera were obtained from 6 mosquito species. The new isolates were identified as Getah virus (GETV), Japanese encephalitis virus (JEV), Yunnan Culex-related flavivirus (YNCxFV), Yunnan Aedes-related flavivirus (YNAeFV), Banna virus (BAV), Yunnan orbivirus (YUOV), Banna orbivirus (BAOV), Yunnan totivirus (YNToV), Nam Dinh virus (NDiV), Menghai rhabdovirus (MRV), and Anopheles minimus iridovirus (AMIV)...
October 30, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/29076102/epidemiological-profile-of-acute-viral-encephalitis
#19
Rajesh Kumar, Pankaj Kumar, Manoj Kumar Singh, Dipti Agarwal, Bendangienla Jamir, Shashi Khare, Samrendra Narayan
OBJECTIVE: To study the etiology and clinico-epidemiological profile of acute viral encephalitis in children with acute encephalitis syndrome (AES). METHODS: An observational study including 100 patients fulfilling the criteria for AES was conducted in children of age group 1 mo - 16 y. Viral isolation was done on RD cells, HEp-2 cells and Vero cells from the cerebrospinal fluid samples of suspected viral encephalitis (VE) cases. An enzyme immunoassay for IgM antibodies was performed for measles, mumps, Varicella zoster virus (VZV), Herpes simplex virus 1 (HSV1) and Japanese encephalitis virus (JEV)...
October 27, 2017: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/29058107/zika-virus-isolated-from-mosquitoes-a-field-and-laboratory-investigation-in-china-2016
#20
Shihong Fu, Song Song, Hong Liu, Yuanyuan Li, Xiaolong Li, Xiaoyan Gao, Ziqian Xu, Guoping Liu, Dingming Wang, Zhenzao Tian, Jingzhu Zhou, Ying He, Wenwen Lei, Huanyu Wang, Bin Wang, Xiaoqing Lu, Guodong Liang
A field investigation of arboviruses was conducted in Dejiang, Guizhou Province in the summer of 2016. A total of 8,795 mosquitoes, belonging to four species of three genera, and 1,300 midges were collected. The mosquito samples were identified on site according to their morphology, and the pooled samples were ground and centrifuged in the laboratory. The supernatant was incubated with mosquito tissue culture cells (C6/36) and mammalian cells (BHK-21) for virus isolation. The results indicated that 40% (3,540/8,795) were Anopheles sinensis, 30% (2,700/8,795) were Culex pipiens quinquefasciatus, and 29% (2,530/8,795) were Armigeres subbalbeatus...
October 19, 2017: Science China. Life Sciences
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